As extracted from the .exe, the cheat codes are:
There is some sort of console by pressing tilde/grave (~ or `).
It crashes for me upon entering the menu when I try to load it normally in DOSBox, so I circumvented it with -level1 command line parameter.
MIDIs don't play; CD audio is supported.
I mounted the SW CD and it played the end-of-level screen music (track 2) for the first level rather than the normal track (track 3).
The sword is not implemented.
There are more frames for the fists of fury, like a palming sprite.
Occasionally, when you punch a hitscan wall texture, a reddish-brown Mighty Foot comes up and kicks, breaking it.
Shooting a ninja with the railgun crashed the game.
The weapon slots are juggled somewhat.
There is much more emphasis on shurikens.
The dustbin animation doesn't work.
The Ripper heart has a maximum of 20 ammo rather than 5. It does not spawn an AI-controlled Lo Wang. Instead, it does... something. It requires several firings to achieve this effect, and the enemy spears to be in pain and blood spurts out, but no damage appears to be done.
The end of level screen is merely a placeholder. While the art for the Dojo scene is present, the ENDLEV3.VOC sound is not, CD audio behavior indicates no results track, and all that's displayed is the red SW main menu background with some simplistic statistics.
The difficulty settings are "Tiny grasshopper", "I kill you", "Very bad man", and "Taksan balls".
The fortune cookie sayings are, as extracted from the .exe: